CA2073924A1 - Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method - Google Patents
Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the methodInfo
- Publication number
- CA2073924A1 CA2073924A1 CA2073924A CA2073924A CA2073924A1 CA 2073924 A1 CA2073924 A1 CA 2073924A1 CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A1 CA2073924 A1 CA 2073924A1
- Authority
- CA
- Canada
- Prior art keywords
- magneto
- optical recording
- recording medium
- magnetic layer
- reproduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/10508—Recording by modulating only the magnetic field at the transducer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10515—Reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
Abstract
A magneto-optical recording method employs a magneto-optical recording medium having a first magnetic layer which exhibits low coercive force at room temper-ature and high Curie temperature and a second magnetic layer which is exchange-coupled to the first magnetic layer and which exhibits a higher coercive force and a lower Curie temperature as compared with those of the first magnetic layer. A magnetic field modulated in accordance with information to be recorded is applied to the magneto-optical recording medium while irradiating it with a light beam of a constant intensity so as to record the information. The recorded information is simultaneously confirmed by using a reflected light of this light beam.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3-175159 | 1991-07-16 | ||
JP3175159A JPH0520720A (en) | 1991-07-16 | 1991-07-16 | Magneto-optical recording system |
JP3218446A JPH0554452A (en) | 1991-08-29 | 1991-08-29 | Magneto-optical recording medium |
JP3-218446 | 1991-08-29 | ||
JP4-18451 | 1992-01-08 | ||
JP04018451A JP3077848B2 (en) | 1992-01-08 | 1992-01-08 | Magneto-optical recording medium, magneto-optical recording method, and magneto-optical reproducing method |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2073924A1 true CA2073924A1 (en) | 1993-01-17 |
CA2073924C CA2073924C (en) | 1997-03-04 |
Family
ID=27282213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002073924A Expired - Fee Related CA2073924C (en) | 1991-07-16 | 1992-07-15 | Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method |
Country Status (5)
Country | Link |
---|---|
US (1) | US5428586A (en) |
EP (2) | EP0523944A3 (en) |
KR (1) | KR960016891B1 (en) |
AU (1) | AU660315B2 (en) |
CA (1) | CA2073924C (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05144114A (en) * | 1991-11-19 | 1993-06-11 | Canon Inc | Magneto-optical recorder |
JP2957367B2 (en) * | 1993-01-07 | 1999-10-04 | シャープ株式会社 | Magneto-optical recording medium, recording method and recording / reproduction method |
JPH06223427A (en) * | 1993-01-29 | 1994-08-12 | Sharp Corp | Magneto-optical recording medium and reproducing method therefor |
JP3287648B2 (en) * | 1993-06-07 | 2002-06-04 | 株式会社リコー | Simultaneous recording verification method for phase change type information recording medium and phase change type information recording drive device |
JP3375694B2 (en) * | 1993-07-19 | 2003-02-10 | パイオニア株式会社 | Magneto-optical disk and magneto-optical disk reproducing device |
US5596555A (en) * | 1993-07-29 | 1997-01-21 | Canon Kabushiki Kaisha | Magnetooptical recording medium having magnetic layers that satisfy predetermined coercive force relationships, and recording/reproduction method for the medium |
WO1995010111A1 (en) * | 1993-10-06 | 1995-04-13 | Nikon Corporation | Optical disk recording device |
JP3333613B2 (en) * | 1993-12-07 | 2002-10-15 | 株式会社日立製作所 | Optical information recording medium, optical information recording / reproducing method, and optical information recording / reproducing apparatus |
CA2142767C (en) * | 1994-02-21 | 1998-11-17 | Naoki Nishimura | Magneto-optical recording medium, and information reproducing method using the medium |
JPH07244876A (en) * | 1994-03-01 | 1995-09-19 | Sharp Corp | Magneto-optic recording medium and magneto-optically recording/reproducing method |
JPH07254175A (en) * | 1994-03-16 | 1995-10-03 | Canon Inc | Magneto-optical recording medium and method for recording and reproducing information with same medium |
JPH07320320A (en) * | 1994-05-24 | 1995-12-08 | Sharp Corp | Magneto-optical recording medium, recording and reproducing method of magneto-optically recorded information |
US5414678A (en) * | 1994-09-02 | 1995-05-09 | Minnesota Mining And Manufacturing Company | Magneto-optic recording medium having two recording layers, and drive for same |
JP2950181B2 (en) * | 1995-02-16 | 1999-09-20 | 日本電気株式会社 | Magneto-optical disk recording device |
JP2783179B2 (en) * | 1995-02-27 | 1998-08-06 | 日本電気株式会社 | Optical information recording / reproducing method and recording / reproducing apparatus |
EP0735532A3 (en) * | 1995-03-28 | 1997-10-01 | Nippon Kogaku Kk | Optical recording method and control |
US6423430B1 (en) * | 1995-07-17 | 2002-07-23 | Samsung Electronics Co., Ltd. | Magneto-optical recording medium for short wavelength |
US5968678A (en) * | 1995-08-31 | 1999-10-19 | Sanyo Electric., Ltd. | Magneto-optical recording medium and manufacturing method thereof |
JP2812266B2 (en) * | 1995-10-19 | 1998-10-22 | 日本電気株式会社 | Magneto-optical disk recording apparatus and magneto-optical disk recording method |
EP0833317B1 (en) * | 1996-08-27 | 2006-01-11 | Matsushita Electric Industrial Co., Ltd. | Magneto-optical recording medium and readout method of the same |
JPH1092037A (en) * | 1996-09-19 | 1998-04-10 | Canon Inc | Magnetooptical recording and reproducing method and device therefor |
JPH1092046A (en) * | 1996-09-19 | 1998-04-10 | Canon Inc | Magnetooptical information reproducing device |
JPH10275369A (en) | 1997-01-31 | 1998-10-13 | Canon Inc | Manufacture of information recording medium and information recording medium made by the same |
JPH11134732A (en) | 1997-08-29 | 1999-05-21 | Canon Inc | Information recording/reproducing method |
JP3703315B2 (en) * | 1997-10-01 | 2005-10-05 | キヤノン株式会社 | Magneto-optical recording and reproducing method and reproducing apparatus therefor |
US6298015B1 (en) | 1998-06-03 | 2001-10-02 | Canon Kabushiki Kaisha | Magneto-optical reproducing method using a magnified magnetic domain |
JP2001023259A (en) * | 1999-07-09 | 2001-01-26 | Sony Corp | Magneto-optical recording medium and its production |
WO2003023767A2 (en) * | 2001-09-12 | 2003-03-20 | Koninklijke Philips Electronics N.V. | Radiation power and/or field control for domain expansion recording medium |
JP3938075B2 (en) * | 2003-03-11 | 2007-06-27 | ヤマハ株式会社 | Optical disc recording method and optical disc recording apparatus |
JP2005346843A (en) * | 2004-06-03 | 2005-12-15 | Canon Inc | Optical information recording and reproducing method and device |
US7599272B2 (en) * | 2004-11-22 | 2009-10-06 | Canon Kabushiki Kaisha | Method and apparatus for recording and reproducing multi-level information |
US7804754B2 (en) | 2005-08-31 | 2010-09-28 | Canon Kabushiki Kaisha | Optical information recording/reproducing method |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06105509B2 (en) * | 1985-05-31 | 1994-12-21 | キヤノン株式会社 | Magneto-optical recording / reproducing device |
US4694358A (en) * | 1985-10-28 | 1987-09-15 | Kerdix, Inc. | Magneto-optic recording structure and method |
JPS62137754A (en) * | 1985-12-09 | 1987-06-20 | Canon Inc | Photomagnetic recording and reproducing system and photomagnetic memory medium used to said recording and reproducing system |
ATE216528T1 (en) * | 1986-07-08 | 2002-05-15 | Canon Kk | APPARATUS AND SYSTEM FOR RECORDING ON A MAGNETOPTICAL RECORDING MEDIUM |
US4883710A (en) * | 1986-10-28 | 1989-11-28 | Ricoh Company, Ltd. | Magneto-optical recording medium |
JPH0782674B2 (en) * | 1986-11-06 | 1995-09-06 | キヤノン株式会社 | Magneto-optical memory medium |
JPH01165056A (en) * | 1987-09-21 | 1989-06-29 | Sharp Corp | Optical information recording and reproducing device |
DE3885992T2 (en) * | 1987-09-22 | 1994-06-09 | Hitachi Maxell | Optical information recording / reproducing device. |
JPH01149246A (en) * | 1987-12-04 | 1989-06-12 | Sony Corp | Magneto-optical recording medium |
JPH01217744A (en) * | 1988-02-24 | 1989-08-31 | Toshiba Corp | Magneto-optical recording medium |
CA1326547C (en) * | 1988-07-13 | 1994-01-25 | Masahiko Kaneko | Thermomagnetic recording method |
JPH0278042A (en) * | 1988-09-14 | 1990-03-19 | Mitsubishi Electric Corp | Magneto-optical recording medium and device used for this medium |
EP0368194B1 (en) * | 1988-11-07 | 1998-06-17 | Hitachi, Ltd. | Magneto-optical recording medium |
US5163031A (en) * | 1988-12-07 | 1992-11-10 | Canon Kabushiki Kaisha | Method of recording tetra-value signal on magneto-optical recording medium with plural magnetic layers |
JPH02201756A (en) * | 1989-01-31 | 1990-08-09 | Seiko Epson Corp | Magneto-optical recording medium |
JPH0373448A (en) * | 1989-05-10 | 1991-03-28 | Ricoh Co Ltd | Magneto-optical recording method |
JPH0386955A (en) * | 1989-06-09 | 1991-04-11 | Ricoh Co Ltd | Recording/erasing confirming method for magneto-optical recording system |
US5168482A (en) * | 1989-08-31 | 1992-12-01 | Sony Corporation | Magnetooptical recording and playback method employing multi-layer recording medium with record holding layer and playback layer |
US6200673B1 (en) * | 1989-11-13 | 2001-03-13 | Hitachi, Ltd. | Magneto-optical recording medium |
CA2026740C (en) * | 1989-11-20 | 1995-08-29 | Morovat Tayefeh | Sensing previously-recorded information while recording or erasing a magnetooptic storage number |
JPH03189929A (en) * | 1989-12-20 | 1991-08-19 | Hitachi Maxell Ltd | Magnetic card and recording and reproducing method thereof |
JP2574911B2 (en) * | 1990-01-10 | 1997-01-22 | シャープ株式会社 | Magneto-optical recording method |
JP3412163B2 (en) * | 1991-05-24 | 2003-06-03 | 松下電器産業株式会社 | Magneto-optical disk drive |
NL9101796A (en) * | 1991-10-25 | 1993-05-17 | Nederland Ptt | METHOD FOR AUTHENTICATING COMMUNICATION PARTICIPANTS, METHOD FOR USING THE METHOD AND FIRST COMMUNICATION PARTICIPANT AND SECOND COMMUNICATION PARTICIPANT FOR USE IN THE SYSTEM. |
JPH06103622A (en) * | 1992-09-18 | 1994-04-15 | Nikon Corp | Overwritable magneto-optical recording medium having r layer |
-
1992
- 1992-07-14 EP EP19920306408 patent/EP0523944A3/en not_active Withdrawn
- 1992-07-14 EP EP97202863A patent/EP0818783A3/en not_active Ceased
- 1992-07-15 AU AU20308/92A patent/AU660315B2/en not_active Ceased
- 1992-07-15 CA CA002073924A patent/CA2073924C/en not_active Expired - Fee Related
- 1992-07-16 KR KR1019920012709A patent/KR960016891B1/en not_active IP Right Cessation
-
1994
- 1994-06-08 US US08/257,453 patent/US5428586A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
KR960016891B1 (en) | 1996-12-26 |
EP0818783A2 (en) | 1998-01-14 |
AU2030892A (en) | 1993-01-21 |
AU660315B2 (en) | 1995-06-22 |
KR930003043A (en) | 1993-02-23 |
EP0523944A2 (en) | 1993-01-20 |
EP0818783A3 (en) | 1999-04-14 |
US5428586A (en) | 1995-06-27 |
CA2073924C (en) | 1997-03-04 |
EP0523944A3 (en) | 1994-02-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |